1988865049 has 2 divisors, whose sum is σ = 1988865050. Its totient is φ = 1988865048.

The previous prime is 1988864987. The next prime is 1988865059. The reversal of 1988865049 is 9405688891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276775824 + 712089225 = 35732^2 + 26685^2 .

It is an emirp because it is prime and its reverse (9405688891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988865049 - 2¹⁵ = 1988832281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1988864984 and 1988865002.

It is not a weakly prime, because it can be changed into another prime (1988865059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994432524 + 994432525.

It is an arithmetic number, because the mean of its divisors is an integer number (994432525).

Almost surely, 2^1988865049 is an apocalyptic number.

It is an amenable number.

1988865049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988865049 is an equidigital number, since it uses as much as digits as its factorization.

1988865049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The square root of 1988865049 is about 44596.6932518544. The cubic root of 1988865049 is about 1257.5785039531.

The spelling of 1988865049 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-five thousand, forty-nine".